interface/wx/treectrl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        treectrl.h
   3 // Purpose:     interface of wxTreeItemData
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10 /**
  11     @class wxTreeCtrl
  12
  13     A tree control presents information as a hierarchy, with items that may be
  14     expanded to show further items. Items in a tree control are referenced by
  15     wxTreeItemId handles, which may be tested for validity by calling
  16     wxTreeItemId::IsOk().
  17
  18     A similar control with a fully native implemtation for GTK+ and OS X
  19     as well is wxDataViewTreeCtrl.
  20
  21     To intercept events from a tree control, use the event table macros
  22     described in wxTreeEvent.
  23
  24     @beginStyleTable
  25     @style{wxTR_EDIT_LABELS}
  26         Use this style if you wish the user to be able to edit labels in the
  27         tree control.
  28     @style{wxTR_NO_BUTTONS}
  29         For convenience to document that no buttons are to be drawn.
  30     @style{wxTR_HAS_BUTTONS}
  31         Use this style to show + and - buttons to the left of parent items.
  32     @style{wxTR_NO_LINES}
  33         Use this style to hide vertical level connectors.
  34     @style{wxTR_FULL_ROW_HIGHLIGHT}
  35         Use this style to have the background colour and the selection highlight
  36         extend over the entire horizontal row of the tree control window. (This
  37         flag is ignored under Windows unless you specify @c wxTR_NO_LINES as
  38         well.)
  39     @style{wxTR_LINES_AT_ROOT}
  40         Use this style to show lines between root nodes. Only applicable if @c
  41         wxTR_HIDE_ROOT is set and @c wxTR_NO_LINES is not set.
  42     @style{wxTR_HIDE_ROOT}
  43         Use this style to suppress the display of the root node, effectively
  44         causing the first-level nodes to appear as a series of root nodes.
  45     @style{wxTR_ROW_LINES}
  46         Use this style to draw a contrasting border between displayed rows.
  47     @style{wxTR_HAS_VARIABLE_ROW_HEIGHT}
  48         Use this style to cause row heights to be just big enough to fit the
  49         content. If not set, all rows use the largest row height. The default is
  50         that this flag is unset. Generic only.
  51     @style{wxTR_SINGLE}
  52         For convenience to document that only one item may be selected at a
  53         time. Selecting another item causes the current selection, if any, to be
  54         deselected. This is the default.
  55     @style{wxTR_MULTIPLE}
  56         Use this style to allow a range of items to be selected. If a second
  57         range is selected, the current range, if any, is deselected.
  58     @style{wxTR_DEFAULT_STYLE}
  59         The set of flags that are closest to the defaults for the native control
  60         for a particular toolkit.
  61     @endStyleTable
  62
  63     @beginEventEmissionTable{wxTreeEvent}
  64     @event{EVT_TREE_BEGIN_DRAG(id, func)}
  65           Begin dragging with the left mouse button.
  66           If you want to enable left-dragging you need to intercept this event
  67           and explicitely call wxTreeEvent::Allow(), as it's vetoed by default.
  68     @event{EVT_TREE_BEGIN_RDRAG(id, func)}
  69           Begin dragging with the right mouse button.
  70           If you want to enable right-dragging you need to intercept this event
  71           and explicitely call wxTreeEvent::Allow(), as it's vetoed by default.
  72     @event{EVT_TREE_END_DRAG(id, func)}
  73           End dragging with the left or right mouse button.
  74     @event{EVT_TREE_BEGIN_LABEL_EDIT(id, func)}
  75           Begin editing a label. This can be prevented by calling Veto().
  76     @event{EVT_TREE_END_LABEL_EDIT(id, func)}
  77           Finish editing a label. This can be prevented by calling Veto().
  78     @event{EVT_TREE_DELETE_ITEM(id, func)}
  79           An item was deleted.
  80     @event{EVT_TREE_GET_INFO(id, func)}
  81           Request information from the application.
  82     @event{EVT_TREE_SET_INFO(id, func)}
  83           Information is being supplied.
  84     @event{EVT_TREE_ITEM_ACTIVATED(id, func)}
  85           The item has been activated, i.e. chosen by double clicking it with
  86           mouse or from keyboard.
  87     @event{EVT_TREE_ITEM_COLLAPSED(id, func)}
  88           The item has been collapsed.
  89     @event{EVT_TREE_ITEM_COLLAPSING(id, func)}
  90           The item is being collapsed. This can be prevented by calling Veto().
  91     @event{EVT_TREE_ITEM_EXPANDED(id, func)}
  92           The item has been expanded.
  93     @event{EVT_TREE_ITEM_EXPANDING(id, func)}
  94           The item is being expanded. This can be prevented by calling Veto().
  95     @event{EVT_TREE_ITEM_RIGHT_CLICK(id, func)}
  96           The user has clicked the item with the right mouse button.
  97     @event{EVT_TREE_ITEM_MIDDLE_CLICK(id, func)}
  98           The user has clicked the item with the middle mouse button.
  99     @event{EVT_TREE_SEL_CHANGED(id, func)}
 100           Selection has changed.
 101     @event{EVT_TREE_SEL_CHANGING(id, func)}
 102           Selection is changing. This can be prevented by calling Veto().
 103     @event{EVT_TREE_KEY_DOWN(id, func)}
 104           A key has been pressed.
 105     @event{EVT_TREE_ITEM_GETTOOLTIP(id, func)}
 106           The opportunity to set the item tooltip is being given to the application
 107           (call wxTreeEvent::SetToolTip). Windows only.
 108     @event{EVT_TREE_ITEM_MENU(id, func)}
 109           The context menu for the selected item has been requested, either by a
 110           right click or by using the menu key.
 111     @event{EVT_TREE_STATE_IMAGE_CLICK(id, func)}
 112           The state image has been clicked. Windows only.
 113     @endEventTable
 114
 115
 116     See also @ref overview_windowstyles.
 117
 118     @b Win32 @b notes:
 119
 120     wxTreeCtrl class uses the standard common treeview control under Win32
 121     implemented in the system library comctl32.dll. Some versions of this
 122     library are known to have bugs with handling the tree control colours: the
 123     usual symptom is that the expanded items leave black (or otherwise
 124     incorrectly coloured) background behind them, especially for the controls
 125     using non-default background colour. The recommended solution is to upgrade
 126     the comctl32.dll to a newer version: see
 127     http://www.microsoft.com/downloads/details.aspx?familyid=cb2cf3a2-8025-4e8f-8511-9b476a8d35d2
 128
 129     @library{wxcore}
 130     @category{ctrl}
 131     @appearance{treectrl.png}
 132
 133     @see wxDataViewTreeCtrl, wxTreeEvent, wxTreeItemData, @ref overview_treectrl,
 134          wxListBox, wxListCtrl, wxImageList
 135 */
 136 class wxTreeCtrl : public wxControl
 137 {
 138 public:
 139     /**
 140         Default Constructor.
 141     */
 142     wxTreeCtrl();
 143
 144     /**
 145         Constructor, creating and showing a tree control.
 146
 147         @param parent
 148             Parent window. Must not be @NULL.
 149         @param id
 150             Window identifier. The value @c wxID_ANY indicates a default value.
 151         @param pos
 152             Window position.
 153             If ::wxDefaultPosition is specified then a default position is chosen.
 154         @param size
 155             Window size.
 156             If ::wxDefaultSize is specified then the window is sized appropriately.
 157         @param style
 158             Window style. See wxTreeCtrl.
 159         @param validator
 160             Window validator.
 161         @param name
 162             Window name.
 163
 164         @see Create(), wxValidator
 165     */
 166     wxTreeCtrl(wxWindow* parent, wxWindowID id = wxID_ANY,
 167                const wxPoint& pos = wxDefaultPosition,
 168                const wxSize& size = wxDefaultSize,
 169                long style = wxTR_DEFAULT_STYLE,
 170                const wxValidator& validator = wxDefaultValidator,
 171                const wxString& name = wxTreeCtrlNameStr);
 172
 173
 174     /**
 175         Destructor, destroying the tree control.
 176     */
 177     virtual ~wxTreeCtrl();
 178
 179     /**
 180         Adds the root node to the tree, returning the new item.
 181
 182         The @a image and @a selImage parameters are an index within the normal
 183         image list specifying the image to use for unselected and selected
 184         items, respectively. If @a image -1 and @a selImage is -1, the same
 185         image is used for both selected and unselected items.
 186     */
 187     virtual wxTreeItemId AddRoot(const wxString& text, int image = -1,
 188                                  int selImage = -1,
 189                                  wxTreeItemData* data = NULL);
 190
 191     /**
 192         Appends an item to the end of the branch identified by @a parent, return
 193         a new item id.
 194
 195         The @a image and @a selImage parameters are an index within the normal
 196         image list specifying the image to use for unselected and selected
 197         items, respectively. If @a image -1 and @a selImage is -1, the same
 198         image is used for both selected and unselected items.
 199     */
 200     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 201                             const wxString& text,
 202                             int image = -1,
 203                             int selImage = -1,
 204                             wxTreeItemData* data = NULL);
 205
 206     /**
 207         Sets the buttons image list. The button images assigned with this method
 208         will be automatically deleted by wxTreeCtrl as appropriate (i.e. it
 209         takes ownership of the list).
 210
 211         Setting or assigning the button image list enables the display of image
 212         buttons. Once enabled, the only way to disable the display of button
 213         images is to set the button image list to @NULL.
 214
 215         This function is only available in the generic version.
 216
 217         @see SetButtonsImageList().
 218     */
 219     void AssignButtonsImageList(wxImageList* imageList);
 220
 221     /**
 222         Sets the normal image list. The image list assigned with this method
 223         will be automatically deleted by wxTreeCtrl as appropriate (i.e. it
 224         takes ownership of the list).
 225
 226         @see SetImageList().
 227     */
 228     void AssignImageList(wxImageList* imageList);
 229
 230     /**
 231         Sets the state image list. Image list assigned with this method will be
 232         automatically deleted by wxTreeCtrl as appropriate (i.e. it takes
 233         ownership of the list).
 234
 235         @see SetStateImageList().
 236     */
 237     void AssignStateImageList(wxImageList* imageList);
 238
 239     /**
 240         Collapses the given item.
 241     */
 242     virtual void Collapse(const wxTreeItemId& item);
 243
 244     /**
 245         Collapses the root item.
 246
 247         @see ExpandAll()
 248     */
 249     void CollapseAll();
 250
 251     /**
 252         Collapses this item and all of its children, recursively.
 253
 254         @see ExpandAllChildren()
 255     */
 256     void CollapseAllChildren(const wxTreeItemId& item);
 257
 258     /**
 259         Collapses the given item and removes all children.
 260     */
 261     virtual void CollapseAndReset(const wxTreeItemId& item);
 262
 263     /**
 264         Creates the tree control.
 265         See wxTreeCtrl::wxTreeCtrl() for further details.
 266     */
 267     bool Create(wxWindow* parent, wxWindowID id = wxID_ANY,
 268                 const wxPoint& pos = wxDefaultPosition,
 269                 const wxSize& size = wxDefaultSize,
 270                 long style = wxTR_DEFAULT_STYLE,
 271                 const wxValidator& validator = wxDefaultValidator,
 272                 const wxString& name = wxTreeCtrlNameStr);
 273
 274     /**
 275         Deletes the specified item. A @c EVT_TREE_DELETE_ITEM event will be
 276         generated.
 277
 278         This function may cause a subsequent call to GetNextChild() to fail.
 279     */
 280     virtual void Delete(const wxTreeItemId& item);
 281
 282     /**
 283         Deletes all items in the control. Note that this may not generate
 284         @c EVT_TREE_DELETE_ITEM events under some Windows versions although
 285         normally such event is generated for each removed item.
 286     */
 287     virtual void DeleteAllItems();
 288
 289     /**
 290         Deletes all children of the given item (but not the item itself). Note
 291         that this will @b not generate any events unlike Delete() method.
 292
 293         If you have called SetItemHasChildren(), you may need to call it again
 294         since DeleteChildren() does not automatically clear the setting.
 295     */
 296     virtual void DeleteChildren(const wxTreeItemId& item);
 297
 298     /**
 299         Starts editing the label of the given @a item. This function generates a
 300         @c EVT_TREE_BEGIN_LABEL_EDIT event which can be vetoed so that no text
 301         control will appear for in-place editing.
 302
 303         If the user changed the label (i.e. s/he does not press ESC or leave the
 304         text control without changes, a @c EVT_TREE_END_LABEL_EDIT event will be
 305         sent which can be vetoed as well.
 306
 307         @see EndEditLabel(), wxTreeEvent
 308     */
 309     virtual wxTextCtrl *EditLabel(const wxTreeItemId& item,
 310                                   wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
 311
 312     /**
 313         Ends label editing. If @a cancelEdit is @true, the edit will be
 314         cancelled.
 315
 316         @note
 317             This function is currently supported under Windows only.
 318
 319         @see EditLabel()
 320     */
 321     virtual void EndEditLabel(const wxTreeItemId& item, bool discardChanges = false);
 322
 323     /**
 324         Scrolls and/or expands items to ensure that the given item is visible.
 325     */
 326     virtual void EnsureVisible(const wxTreeItemId& item);
 327
 328     /**
 329         Expands the given item.
 330     */
 331     virtual void Expand(const wxTreeItemId& item);
 332
 333     /**
 334         Expands all items in the tree.
 335     */
 336     void ExpandAll();
 337
 338     /**
 339         Expands the given item and all its children recursively.
 340     */
 341     void ExpandAllChildren(const wxTreeItemId& item);
 342
 343     /**
 344         Retrieves the rectangle bounding the @a item. If @a textOnly is @true,
 345         only the rectangle around the item's label will be returned, otherwise
 346         the item's image is also taken into account.
 347
 348         The return value is @true if the rectangle was successfully retrieved or
 349         @c @false if it was not (in this case @a rect is not changed) -- for
 350         example, if the item is currently invisible.
 351
 352         Notice that the rectangle coordinates are logical, not physical ones.
 353         So, for example, the x coordinate may be negative if the tree has a
 354         horizontal scrollbar and its position is not 0.
 355
 356         @beginWxPythonOnly
 357         The wxPython version of this method requires only the @a item and @a
 358         textOnly parameters. The return value is either a wxRect object or @c
 359         None.
 360         @endWxPythonOnly
 361
 362         @beginWxPerlOnly
 363         In wxPerl this method only takes the @a item and
 364         @a textOnly parameters and returns a @c Wx::Rect (or @c undef).
 365         @endWxPerlOnly
 366     */
 367     virtual bool GetBoundingRect(const wxTreeItemId& item, wxRect& rect,
 368                                  bool textOnly = false) const;
 369
 370     /**
 371         Returns the buttons image list (from which application-defined button
 372         images are taken).
 373
 374         This function is only available in the generic version.
 375     */
 376     wxImageList* GetButtonsImageList() const;
 377
 378     /**
 379         Returns the number of items in the branch. If @a recursively is @true,
 380         returns the total number of descendants, otherwise only one level of
 381         children is counted.
 382     */
 383     virtual size_t GetChildrenCount(const wxTreeItemId& item,
 384                                     bool recursively = true) const;
 385
 386     /**
 387         Returns the number of items in the control.
 388     */
 389     virtual unsigned int GetCount() const;
 390
 391     /**
 392         Returns the edit control being currently used to edit a label. Returns
 393         @NULL if no label is being edited.
 394
 395         @note This is currently only implemented for wxMSW.
 396     */
 397     virtual wxTextCtrl* GetEditControl() const;
 398
 399     /**
 400         Returns the first child; call GetNextChild() for the next child.
 401
 402         For this enumeration function you must pass in a 'cookie' parameter
 403         which is opaque for the application but is necessary for the library to
 404         make these functions reentrant (i.e. allow more than one enumeration on
 405         one and the same object simultaneously). The cookie passed to
 406         GetFirstChild() and GetNextChild() should be the same variable.
 407
 408         Returns an invalid tree item (i.e. wxTreeItemId::IsOk() returns @false)
 409         if there are no further children.
 410
 411         @beginWxPythonOnly
 412         In wxPython the returned wxTreeItemId and the new cookie value are both
 413         returned as a tuple containing the two values.
 414         @endWxPythonOnly
 415
 416         @beginWxPerlOnly
 417         In wxPerl this method only takes the @a item parameter, and
 418         returns a 2-element list (item, cookie).
 419         @endWxPerlOnly
 420
 421         @see GetNextChild(), GetNextSibling()
 422     */
 423     virtual wxTreeItemId GetFirstChild(const wxTreeItemId& item,
 424                                        wxTreeItemIdValue& cookie) const;
 425
 426     /**
 427         Returns the first visible item.
 428     */
 429     virtual wxTreeItemId GetFirstVisibleItem() const;
 430
 431     /**
 432         Returns the item last clicked or otherwise selected.
 433         Unlike GetSelection(), it can be used whether or not
 434         the control has the @c wxTR_MULTIPLE style.
 435
 436         @since 2.9.1
 437     */
 438     virtual wxTreeItemId GetFocusedItem() const;
 439
 440     /**
 441         Returns the normal image list.
 442     */
 443     wxImageList* GetImageList() const;
 444
 445     /**
 446         Returns the current tree control indentation.
 447     */
 448     virtual unsigned int GetIndent() const;
 449
 450     /**
 451         Returns the background colour of the item.
 452     */
 453     virtual wxColour GetItemBackgroundColour(const wxTreeItemId& item) const;
 454
 455     /**
 456         Returns the tree item data associated with the item.
 457
 458         @see wxTreeItemData
 459
 460         @beginWxPythonOnly
 461         wxPython provides the following shortcut method:
 462         @li GetPyData(item): Returns the Python Object associated with the
 463             wxTreeItemData for the given item Id.
 464         @endWxPythonOnly
 465
 466         @beginWxPerlOnly
 467         wxPerl provides the following shortcut method:
 468         - GetPlData(item): returns the Perl data
 469           associated with the Wx::TreeItemData. It is just the same as
 470           tree->GetItemData(item)->GetData().
 471         @endWxPerlOnly
 472     */
 473     virtual wxTreeItemData* GetItemData(const wxTreeItemId& item) const;
 474
 475     /**
 476         Returns the font of the item label.
 477     */
 478     virtual wxFont GetItemFont(const wxTreeItemId& item) const;
 479
 480     /**
 481         Gets the specified item image. The value of @a which may be:
 482         - ::wxTreeItemIcon_Normal: to get the normal item image.
 483         - ::wxTreeItemIcon_Selected: to get the selected item image (i.e. the
 484             image which is shown when the item is currently selected).
 485         - ::wxTreeItemIcon_Expanded: to get the expanded image (this only makes
 486             sense for items which have children - then this image is shown when
 487             the item is expanded and the normal image is shown when it is
 488             collapsed).
 489         - ::wxTreeItemIcon_SelectedExpanded: to get the selected expanded image
 490             (which is shown when an expanded item is currently selected).
 491     */
 492     virtual int GetItemImage(const wxTreeItemId& item,
 493                              wxTreeItemIcon which = wxTreeItemIcon_Normal) const;
 494
 495     /**
 496         Returns the item's parent.
 497     */
 498     virtual wxTreeItemId GetItemParent(const wxTreeItemId& item) const;
 499
 500     /**
 501         Gets the specified item state.
 502     */
 503     int GetItemState(const wxTreeItemId& item) const;
 504
 505     /**
 506         Returns the item label.
 507     */
 508     virtual wxString GetItemText(const wxTreeItemId& item) const;
 509
 510     /**
 511         Returns the colour of the item label.
 512     */
 513     virtual wxColour GetItemTextColour(const wxTreeItemId& item) const;
 514
 515     /**
 516         Returns the last child of the item (or an invalid tree item if this item
 517         has no children).
 518
 519         @see GetFirstChild(), GetNextSibling(), GetLastChild()
 520     */
 521     virtual wxTreeItemId GetLastChild(const wxTreeItemId& item) const;
 522
 523     /**
 524         Returns the next child; call GetFirstChild() for the first child. For
 525         this enumeration function you must pass in a 'cookie' parameter which is
 526         opaque for the application but is necessary for the library to make
 527         these functions reentrant (i.e. allow more than one enumeration on one
 528         and the same object simultaneously). The cookie passed to
 529         GetFirstChild() and GetNextChild() should be the same.
 530
 531         Returns an invalid tree item if there are no further children.
 532
 533         @beginWxPythonOnly
 534         In wxPython the returned wxTreeItemId and the new cookie value are both
 535         returned as a tuple containing the two values.
 536         @endWxPythonOnly
 537
 538         @beginWxPerlOnly
 539         In wxPerl this method returns a 2-element list
 540         (item, cookie) instead of modifying its parameters.
 541         @endWxPerlOnly
 542
 543         @see GetFirstChild()
 544     */
 545     virtual wxTreeItemId GetNextChild(const wxTreeItemId& item,
 546                                       wxTreeItemIdValue& cookie) const;
 547
 548     /**
 549         Returns the next sibling of the specified item; call GetPrevSibling()
 550         for the previous sibling.
 551
 552         Returns an invalid tree item if there are no further siblings.
 553
 554         @see GetPrevSibling()
 555     */
 556     virtual wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
 557
 558     /**
 559         Returns the next visible item or an invalid item if this item is the
 560         last visible one.
 561
 562         @note The @a item itself must be visible.
 563     */
 564     virtual wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
 565
 566     /**
 567         Returns the previous sibling of the specified item; call
 568         GetNextSibling() for the next sibling.
 569
 570         Returns an invalid tree item if there are no further children.
 571
 572         @see GetNextSibling()
 573     */
 574     virtual wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;
 575
 576     /**
 577         Returns the previous visible item or an invalid item if this item is the
 578         first visible one.
 579
 580         @note The @a item itself must be visible.
 581     */
 582     virtual wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;
 583
 584     /**
 585         Returns @true if the control will use a quick calculation for the best
 586         size, looking only at the first and last items. The default is @false.
 587
 588         @see SetQuickBestSize()
 589     */
 590     bool GetQuickBestSize() const;
 591
 592     /**
 593         Returns the root item for the tree control.
 594     */
 595     virtual wxTreeItemId GetRootItem() const;
 596
 597     /**
 598         Returns the selection, or an invalid item if there is no selection. This
 599         function only works with the controls without @c wxTR_MULTIPLE style,
 600         use GetSelections() for the controls which do have this style
 601         or, if a single item is wanted, use GetFocusedItem().
 602     */
 603     virtual wxTreeItemId GetSelection() const;
 604
 605     /**
 606         Fills the array of tree items passed in with the currently selected
 607         items. This function can be called only if the control has the @c
 608         wxTR_MULTIPLE style.
 609
 610         Returns the number of selected items.
 611
 612         @beginWxPythonOnly
 613         The wxPython version of this method accepts no parameters and returns a
 614         Python list of @ref wxTreeItemId "wxTreeItemId"s.
 615         @endWxPythonOnly
 616
 617         @beginWxPerlOnly
 618         In wxPerl this method takes no parameters and returns a list of
 619         @c Wx::TreeItemId.
 620         @endWxPerlOnly
 621     */
 622     virtual size_t GetSelections(wxArrayTreeItemIds& selection) const;
 623
 624     /**
 625         Returns the state image list (from which application-defined state
 626         images are taken).
 627     */
 628     wxImageList* GetStateImageList() const;
 629
 630     /**
 631         Calculates which (if any) item is under the given @a point, returning
 632         the tree item id at this point plus extra information @a flags. @a flags
 633         is a bitlist of the following:
 634
 635         - @c wxTREE_HITTEST_ABOVE: Above the client area.
 636         - @c wxTREE_HITTEST_BELOW: Below the client area.
 637         - @c wxTREE_HITTEST_NOWHERE: In the client area but below the last item.
 638         - @c wxTREE_HITTEST_ONITEMBUTTON: On the button associated with an item.
 639         - @c wxTREE_HITTEST_ONITEMICON: On the bitmap associated with an item.
 640         - @c wxTREE_HITTEST_ONITEMINDENT: In the indentation associated with an item.
 641         - @c wxTREE_HITTEST_ONITEMLABEL: On the label (string) associated with an item.
 642         - @c wxTREE_HITTEST_ONITEMRIGHT: In the area to the right of an item.
 643         - @c wxTREE_HITTEST_ONITEMSTATEICON: On the state icon for a tree view
 644           item that is in a user-defined state.
 645         - @c wxTREE_HITTEST_TOLEFT: To the right of the client area.
 646         - @c wxTREE_HITTEST_TORIGHT: To the left of the client area.
 647
 648         @beginWxPythonOnly
 649         In wxPython both the wxTreeItemId and the flags are returned as a tuple.
 650         @endWxPythonOnly
 651
 652         @beginWxPerlOnly
 653         In wxPerl this method only takes the @a point parameter
 654         and returns a 2-element list (item, flags).
 655         @endWxPerlOnly
 656     */
 657     wxTreeItemId HitTest(const wxPoint& point, int& flags) const;
 658
 659
 660     /**
 661         Inserts an item after a given one (@a previous).
 662
 663         The @a image and @a selImage parameters are an index within the normal
 664         image list specifying the image to use for unselected and selected
 665         items, respectively. If @a image -1 and @a selImage is -1, the same
 666         image is used for both selected and unselected items.
 667     */
 668     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 669                             const wxTreeItemId& previous,
 670                             const wxString& text,
 671                             int image = -1,
 672                             int selImage = -1,
 673                             wxTreeItemData* data = NULL);
 674
 675     /**
 676         Inserts an item before one identified
 677         by its position (@a before). @a before must be less than the number of
 678         children.
 679
 680         The @a image and @a selImage parameters are an index within the normal
 681         image list specifying the image to use for unselected and selected
 682         items, respectively. If @a image -1 and @a selImage is -1, the same
 683         image is used for both selected and unselected items.
 684
 685         @beginWxPythonOnly
 686         In wxPython, this form of this method is called @c InsertItemBefore().
 687         @endWxPythonOnly
 688     */
 689     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 690                             size_t before,
 691                             const wxString& text,
 692                             int image = -1,
 693                             int selImage = -1,
 694                             wxTreeItemData* data = NULL);
 695
 696     /**
 697         Returns @true if the given item is in bold state.
 698
 699         @see SetItemBold()
 700     */
 701     virtual bool IsBold(const wxTreeItemId& item) const;
 702
 703     /**
 704         Returns @true if the control is empty (i.e. has no items, even no root
 705         one).
 706     */
 707     bool IsEmpty() const;
 708
 709     /**
 710         Returns @true if the item is expanded (only makes sense if it has
 711         children).
 712     */
 713     virtual bool IsExpanded(const wxTreeItemId& item) const;
 714
 715     /**
 716         Returns @true if the item is selected.
 717     */
 718     virtual bool IsSelected(const wxTreeItemId& item) const;
 719
 720     /**
 721         Returns @true if the item is visible on the screen.
 722     */
 723     virtual bool IsVisible(const wxTreeItemId& item) const;
 724
 725     /**
 726         Returns @true if the item has children.
 727     */
 728     virtual bool ItemHasChildren(const wxTreeItemId& item) const;
 729
 730     /**
 731         Override this function in the derived class to change the sort order of
 732         the items in the tree control. The function should return a negative,
 733         zero or positive value if the first item is less than, equal to or
 734         greater than the second one.
 735
 736         Please note that you @b must use wxRTTI macros DECLARE_DYNAMIC_CLASS()
 737         and IMPLEMENT_DYNAMIC_CLASS() if you override this function because
 738         otherwise the base class considers that it is not overridden and uses
 739         the default comparison, i.e. sorts the items alphabetically, which
 740         allows it optimize away the calls to the virtual function completely.
 741
 742         @see SortChildren()
 743     */
 744     virtual int OnCompareItems(const wxTreeItemId& item1,
 745                                const wxTreeItemId& item2);
 746
 747     /**
 748         Appends an item as the first child of @a parent, return a new item id.
 749
 750         The @a image and @a selImage parameters are an index within the normal
 751         image list specifying the image to use for unselected and selected
 752         items, respectively. If @a image -1 and @a selImage is -1, the same
 753         image is used for both selected and unselected items.
 754     */
 755     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 756                              const wxString& text,
 757                              int image = -1,
 758                              int selImage = -1,
 759                              wxTreeItemData* data = NULL);
 760
 761     /**
 762         Scrolls the specified item into view.
 763     */
 764     virtual void ScrollTo(const wxTreeItemId& item);
 765
 766     /**
 767         Selects the given item. In multiple selection controls, can be also used
 768         to deselect a currently selected item if the value of @a select is
 769         @false.
 770     */
 771     virtual void SelectItem(const wxTreeItemId& item, bool select = true);
 772
 773     /**
 774         Sets the buttons image list (from which application-defined button
 775         images are taken).
 776
 777         The button images assigned with this method will @b not be deleted by
 778         @ref wxTreeCtrl "wxTreeCtrl"'s destructor, you must delete it yourself.
 779         Setting or assigning the button image list enables the display of image
 780         buttons. Once enabled, the only way to disable the display of button
 781         images is to set the button image list to @NULL.
 782
 783         @note This function is only available in the generic version.
 784
 785         @see AssignButtonsImageList().
 786     */
 787     void SetButtonsImageList(wxImageList* imageList);
 788
 789     /**
 790         Sets the normal image list. The image list assigned with this method
 791         will @b not be deleted by @ref wxTreeCtrl "wxTreeCtrl"'s destructor, you
 792         must delete it yourself.
 793
 794         @see AssignImageList().
 795     */
 796     virtual void SetImageList(wxImageList* imageList);
 797
 798     /**
 799         Sets the indentation for the tree control.
 800     */
 801     virtual void SetIndent(unsigned int indent);
 802
 803     /**
 804         Sets the colour of the item's background.
 805     */
 806     virtual void SetItemBackgroundColour(const wxTreeItemId& item,
 807                                          const wxColour& col);
 808
 809     /**
 810         Makes item appear in bold font if @a bold parameter is @true or resets
 811         it to the normal state.
 812
 813         @see IsBold()
 814     */
 815     virtual void SetItemBold(const wxTreeItemId& item, bool bold = true);
 816
 817     /**
 818         Sets the item client data.
 819
 820         Notice that the client data previously associated with the @a item (if
 821         any) is @em not freed by this function and so calling this function
 822         multiple times for the same item will result in memory leaks unless you
 823         delete the old item data pointer yourself.
 824
 825         @beginWxPythonOnly
 826         - @b SetPyData( @a item, @c obj): Associate the given Python Object with
 827             the wxTreeItemData for the given item Id.
 828         @endWxPythonOnly
 829
 830         @beginWxPerlOnly
 831         wxPerl provides the following shortcut method:
 832         - SetPlData(item, data): sets the Perl data
 833           associated with the @c Wx::TreeItemData. It is just the same as
 834           tree->GetItemData(item)->SetData(data).
 835         @endWxPerlOnly
 836     */
 837     virtual void SetItemData(const wxTreeItemId& item, wxTreeItemData* data);
 838
 839
 840     /**
 841         Gives the item the visual feedback for Drag'n'Drop actions, which is
 842         useful if something is dragged from the outside onto the tree control
 843         (as opposed to a DnD operation within the tree control, which already
 844         is implemented internally).
 845     */
 846     virtual void SetItemDropHighlight(const wxTreeItemId& item,
 847                                       bool highlight = true);
 848
 849     /**
 850         Sets the item's font. All items in the tree should have the same height
 851         to avoid text clipping, so the fonts height should be the same for all
 852         of them, although font attributes may vary.
 853
 854         @see SetItemBold()
 855     */
 856     virtual void SetItemFont(const wxTreeItemId& item, const wxFont& font);
 857
 858     /**
 859         Force appearance of the button next to the item. This is useful to
 860         allow the user to expand the items which don't have any children now,
 861         but instead adding them only when needed, thus minimizing memory
 862         usage and loading time.
 863     */
 864     virtual void SetItemHasChildren(const wxTreeItemId& item,
 865                                     bool hasChildren = true);
 866
 867     /**
 868         Sets the specified item's image. See GetItemImage() for the description
 869         of the @a which parameter.
 870     */
 871     virtual void SetItemImage(const wxTreeItemId& item, int image,
 872                               wxTreeItemIcon which = wxTreeItemIcon_Normal);
 873
 874     /**
 875         Sets the specified item state. The value of @a state may be:
 876         - @c wxTREE_ITEMSTATE_NONE: to disable the item state (the state image will
 877             be not displayed).
 878         - @c wxTREE_ITEMSTATE_NEXT: to set the next item state.
 879         - @c wxTREE_ITEMSTATE_PREV: to set the previous item state.
 880     */
 881     void SetItemState(const wxTreeItemId& item, int state);
 882
 883     /**
 884         Sets the item label.
 885     */
 886     virtual void SetItemText(const wxTreeItemId& item, const wxString& text);
 887
 888     /**
 889         Sets the colour of the item's text.
 890     */
 891     virtual void SetItemTextColour(const wxTreeItemId& item,
 892                                    const wxColour& col);
 893
 894     /**
 895         If @true is passed, specifies that the control will use a quick
 896         calculation for the best size, looking only at the first and last items.
 897         Otherwise, it will look at all items. The default is @false.
 898
 899         @see GetQuickBestSize()
 900     */
 901     void SetQuickBestSize(bool quickBestSize);
 902
 903     /**
 904         Sets the state image list (from which application-defined state images
 905         are taken). Image list assigned with this method will @b not be deleted
 906         by @ref wxTreeCtrl "wxTreeCtrl"'s destructor, you must delete it
 907         yourself.
 908
 909         @see AssignStateImageList().
 910     */
 911     virtual void SetStateImageList(wxImageList* imageList);
 912
 913     /**
 914         Sets the mode flags associated with the display of the tree control. The
 915         new mode takes effect immediately.
 916
 917         @note Generic only; MSW ignores changes.
 918     */
 919     void SetWindowStyle(long styles);
 920
 921     /**
 922         Sorts the children of the given item using OnCompareItems().
 923         You should override that method to change the sort order (the default is
 924         ascending case-sensitive alphabetical order).
 925
 926         @see wxTreeItemData, OnCompareItems()
 927     */
 928     virtual void SortChildren(const wxTreeItemId& item);
 929
 930     /**
 931         Toggles the given item between collapsed and expanded states.
 932     */
 933     virtual void Toggle(const wxTreeItemId& item);
 934
 935     /**
 936         Toggles the given item between selected and unselected states. For
 937         multiselection controls only.
 938     */
 939     void ToggleItemSelection(const wxTreeItemId& item);
 940
 941     /**
 942         Removes the selection from the currently selected item (if any).
 943     */
 944     virtual void Unselect();
 945
 946     /**
 947         This function either behaves the same as Unselect() if the control
 948         doesn't have @c wxTR_MULTIPLE style, or removes the selection from all
 949         items if it does have this style.
 950     */
 951     virtual void UnselectAll();
 952
 953     /**
 954         Unselects the given item. This works in multiselection controls only.
 955     */
 956     void UnselectItem(const wxTreeItemId& item);
 957
 958     /**
 959         Select all the immediate children of the given parent.
 960
 961         This function can be used with multiselection controls only.
 962
 963         @since 2.9.1
 964     */
 965     virtual void SelectChildren(const wxTreeItemId& parent);
 966 };
 967
 968
 969
 970 /**
 971     @class wxTreeEvent
 972
 973     A tree event holds information about events associated with wxTreeCtrl
 974     objects.
 975
 976     To process input from a tree control, use these event handler macros to
 977     direct input to member functions that take a wxTreeEvent argument.
 978
 979     @beginEventTable{wxTreeEvent}
 980     @event{EVT_TREE_BEGIN_DRAG(id, func)}
 981         Begin dragging with the left mouse button. If you want to enable
 982         left-dragging you need to intercept this event and explicitely call
 983         wxTreeEvent::Allow(), as it's vetoed by default. Also notice that the
 984         control must have an associated image list (see SetImageList()) to
 985         drag its items under MSW.
 986     @event{EVT_TREE_BEGIN_RDRAG(id, func)}
 987         Begin dragging with the right mouse button. If you want to enable
 988         right-dragging you need to intercept this event and explicitely call
 989         wxTreeEvent::Allow(), as it's vetoed by default.
 990     @event{EVT_TREE_END_DRAG(id, func)}
 991         End dragging with the left or right mouse button.
 992     @event{EVT_TREE_BEGIN_LABEL_EDIT(id, func)}
 993         Begin editing a label. This can be prevented by calling Veto().
 994     @event{EVT_TREE_END_LABEL_EDIT(id, func)}
 995         Finish editing a label. This can be prevented by calling Veto().
 996     @event{EVT_TREE_DELETE_ITEM(id, func)}
 997         Delete an item.
 998     @event{EVT_TREE_GET_INFO(id, func)}
 999         Request information from the application.
1000     @event{EVT_TREE_SET_INFO(id, func)}
1001         Information is being supplied.
1002     @event{EVT_TREE_ITEM_ACTIVATED(id, func)}
1003         The item has been activated, i.e. chosen by double clicking it with
1004         mouse or from keyboard.
1005     @event{EVT_TREE_ITEM_COLLAPSED(id, func)}
1006         The item has been collapsed.
1007     @event{EVT_TREE_ITEM_COLLAPSING(id, func)}
1008         The item is being collapsed. This can be prevented by calling Veto().
1009     @event{EVT_TREE_ITEM_EXPANDED(id, func)}
1010         The item has been expanded.
1011     @event{EVT_TREE_ITEM_EXPANDING(id, func)}
1012         The item is being expanded. This can be prevented by calling Veto().
1013     @event{EVT_TREE_ITEM_RIGHT_CLICK(id, func)}
1014         The user has clicked the item with the right mouse button.
1015     @event{EVT_TREE_ITEM_MIDDLE_CLICK(id, func)}
1016         The user has clicked the item with the middle mouse button.
1017     @event{EVT_TREE_SEL_CHANGED(id, func)}
1018         Selection has changed.
1019     @event{EVT_TREE_SEL_CHANGING(id, func)}
1020         Selection is changing. This can be prevented by calling Veto().
1021     @event{EVT_TREE_KEY_DOWN(id, func)}
1022         A key has been pressed.
1023     @event{EVT_TREE_ITEM_GETTOOLTIP(id, func)}
1024         The opportunity to set the item tooltip is being given to the
1025         application (call SetToolTip()). Windows only.
1026     @event{EVT_TREE_ITEM_MENU(id, func)}
1027         The context menu for the selected item has been requested, either by a
1028         right click or by using the menu key.
1029     @event{EVT_TREE_STATE_IMAGE_CLICK(id, func)}
1030         The state image has been clicked.
1031     @endEventTable
1032
1033     @library{wxbase}
1034     @category{events}
1035
1036     @see wxTreeCtrl
1037 */
1038 class wxTreeEvent : public wxNotifyEvent
1039 {
1040 public:
1041     /**
1042         Constructor, used by wxWidgets itself only.
1043     */
1044     wxTreeEvent(wxEventType commandType, wxTreeCtrl* tree,
1045                 const wxTreeItemId& item = wxTreeItemId());
1046
1047     /**
1048         Returns the item (valid for all events).
1049     */
1050     wxTreeItemId GetItem() const;
1051
1052     /**
1053         Returns the key code if the event is a key event. Use GetKeyEvent() to
1054         get the values of the modifier keys for this event (i.e. Shift or Ctrl).
1055     */
1056     int GetKeyCode() const;
1057
1058     /**
1059         Returns the key event for @c EVT_TREE_KEY_DOWN events.
1060     */
1061     const wxKeyEvent& GetKeyEvent() const;
1062
1063     /**
1064         Returns the label if the event is a begin or end edit label event.
1065     */
1066     const wxString& GetLabel() const;
1067
1068     /**
1069         Returns the old item index (valid for @c EVT_TREE_ITEM_CHANGING and
1070         @c EVT_TREE_ITEM_CHANGED events).
1071     */
1072     wxTreeItemId GetOldItem() const;
1073
1074     /**
1075         Returns the position of the mouse pointer if the event is a drag or
1076         menu-context event.
1077
1078         In both cases the position is in client coordinates - i.e. relative to
1079         the wxTreeCtrl window (so that you can pass it directly to e.g.
1080         wxWindow::PopupMenu()).
1081     */
1082     wxPoint GetPoint() const;
1083
1084     /**
1085         Returns @true if the label edit was cancelled. This should be called
1086         from within an @c EVT_TREE_END_LABEL_EDIT handler.
1087     */
1088     bool IsEditCancelled() const;
1089
1090     /**
1091         Set the tooltip for the item (valid for @c EVT_TREE_ITEM_GETTOOLTIP
1092         events). Windows only.
1093     */
1094     void SetToolTip(const wxString& tooltip);
1095 };